I was looking for paw print fabric some time ago adn googled paw print and got a site that sells mostly animal prints. I don't know what the link was but you might try googling for it.
I found this link
http://www.gointothedogs.com/DOG%20FABRIC.htm
They have a lab pups on black and a lab pups on white
Also a labs on white. Nothing with just a black lab.